2. two roads intersect at 34 degrees. two cars leave the intersection

2. Two roads intersect at 34 degrees. Two cars leave the intersection on diff roads at speeds of 80km/h and 100 km/h. After 2h, a traffic helicopter that is above and between the 2 cars takes readings on them. The angle of depression to the slower car is 20 degrees, and the straight line distance from the helicopter and the car is 100 km. Assume that both cars are traveling at constant speed.
a) Calculate the straight line distance, to nearest km from helicopter to faster car.
b) Determine the altitude of helicoptor to nearest km.